p vs –

p

noun

  • proton 

character

  • The sixteenth letter of the English alphabet, called pee and written in the Latin script. 

–

symbol

  • Used in a compound term when the constituent parts are already hyphenated. 

  • Used to hide letters 

  • Used to connect compound terms with the sense of "to" or to show a relationship 

  • Used to connect a spaced or hyphenated term. 

How often have the words p and – occurred in a corpus of books? (source: Google Ngram Viewer )